Have you heard of successul transfer of a 4-cell embryo on Day3? Your feedback will be helpful.

From my first IVF failed cycle, I had 4-cell embryos on Day3 so embryologist decided to wait till Day5. But on Day5 the embryos were stuck on the morula stage. They were transferred but did not result in pregnancy.

This time around, I am thinking of convincing the embryologist to transfer the 4-cell embryos on Day 3 instead of waiting for Day 5 - do you think this is advisable?